EMPLOYEE WAS CLEANING THE PLANT FEED BELT AT THE TIME OF THE ACCIDENT. HE WAS ABOUT 20 FT. ALONG THE WALKWAY FROM THE BOTTOM OF THE BELT SHOVELING ON THE CATWALK. DUE TO AN UNDETERMINED REASON THE BELTING FELL TO THE GROUND. HE WAS THROWN TO THE GROUND LANDING ON A PILE OF COAL AND MUD.